Question about the status of the air cut-off valve?
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When the hydrocracking unit is not operating with purified air, are the emergency pressure relief valves, the hydrogen exhaust valves, and the low-pressure control valves for the fresh hydrogen buffer tank valves that open when air is present or valves that close when air is present? Seeking guidance from fellow sailors?
The principle for choosing between an air-open valve and an air-close valve is to ensure the safety of the process and equipment in the event of a failure.
After the instrument air is stopped, the pressure in these systems will rise; the air supply is shut off
In case of an accident, shut-off valves are usually installed at the key areas, and the emergency air tanks available are sufficient for a while~~~~
Emergency pressure relief is the safety valve, right? There’s a gas storage tank, and as long as there’s no interlock, its function isn’t affected in the short term. The venting of waste hydrogen and new hydrogen is usually done via air-operated valves
Wind shut-off valve, to ensure the safety of emergency discharge equipment
Emergency pressure relief should be turned on when the air supply is stopped; waste hydrogen should be turned off when the air supply is stopped; the three-reverse-one system should also be turned off when the air supply is stopped.
Generally, the valves in hydrogen-related systems are air-actuated shut-off valves
In an accident scenario, it stays open, but the valve shows FC